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  <title>Overrides built-in functions</title>
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  <div id="layout-content"><div id="function.override-function" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">override_function</h1>
  <p class="verinfo">(PECL apd &gt;= 0.2)</p><p class="refpurpose"><span class="refname">override_function</span> &mdash; <span class="dc-title">Overrides built-in functions</span></p>

 </div>
 <div class="refsect1 description" id="refsect1-function.override-function-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>override_function</strong></span>
    ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$function_name</code></span>
   , <span class="methodparam"><span class="type">string</span> <code class="parameter">$function_args</code></span>
   , <span class="methodparam"><span class="type">string</span> <code class="parameter">$function_code</code></span>
   ) : <span class="type">bool</span></div>

  <p class="para rdfs-comment">
   Overrides built-in functions by replacing them in the symbol table.
  </p>
 </div>



 <div class="refsect1 parameters" id="refsect1-function.override-function-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<code class="parameter">function_name</code></dt>

     <dd>

      <p class="para">
       The function to override.
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">function_args</code></dt>

     <dd>

      <p class="para">
       The function arguments, as a comma separated string.
      </p>
      <p class="para">
       Usually you will want to pass this parameter, as well as the 
       <code class="parameter">function_code</code> parameter, as a single quote 
       delimited string. The reason for using single quoted strings, is to
       protect the variable names from parsing, otherwise, if you use double
       quotes there will be a need to escape the variable names, e.g. 
       \<var class="varname"><var class="varname">$your_var</var></var>.
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">function_code</code></dt>

     <dd>

      <p class="para">
       The new code for the function.
      </p>
     </dd>

    
   </dl>

  </p>
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 <div class="refsect1 returnvalues" id="refsect1-function.override-function-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   成功时返回 <strong><code>TRUE</code></strong>， 或者在失败时返回 <strong><code>FALSE</code></strong>。
  </p>
 </div>

 
 <div class="refsect1 examples" id="refsect1-function.override-function-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-440">
    <p><strong>Example #1 <span class="function"><strong>override_function()</strong></span> example</strong></p>
    <div class="example-contents">
<div class="phpcode"><pre><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />override_function</span><span style="color: #007700">(</span><span style="color: #DD0000">'test'</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'$a,$b'</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'echo&nbsp;"DOING&nbsp;TEST";&nbsp;return&nbsp;$a&nbsp;*&nbsp;$b;'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</pre></div>
    </div>

   </div>
  </p> 
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